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GMS81004单片机解密破解方法

时间:2011-08-02 09:00:39

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 关于GMS81004部分特征介绍:
  A register
  
- 8bit Accumulator.
  
- In the case of 16-bit operation, compose the lower 8-bit of A, upper 8bit in Y (16-bit Accumulator)
  
- In the case of multiplication instrtion, execute as a multiplier register. After multiplication operation, the lower 8-bit of the result enters. (Y*A ?? YA)
  
- In the case of division instrtion, execute as the lower 8-bit of dividend. After division operation, quotient enters.
  
X register
  
- General-purpose 8-bit register
  
- In the case of index addressing mode within direct page(RAM area), execute as index register.
  
- In the case of division instrtion, execute as register.
  
Y register
  
- General-purpose 8-bit register
  
- In the case of index addressing mode, execute as index register
  
- In the case of 16-bit operation instrtion, execute as the upper 8-bit of YA (16-bit accumulator).
  
- In the case of multiplication instrtion, execute as a multiplicand register. After multiplication operation, the upper 8-bit of the result enters.
  
- In the case of division instrtion, execute as the upper 8-bit of dividend. After division operation, remains enters.
  - Can be used as loop counter of conditional branch command.

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